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Before beginning an analysis of net forces in order to study the motion or the equilibrium of a system, one must first define…the system. Only forces exterior to the system are to be considered thereafter.
Note also that for systems at rest, or for those in uniform linear motion, the fundamental principle of dynamics (Newton’s First Law) states that the sum of the exterior forces acting on the system must be zero.
Select the system you want to work with.
The external forces will automatically appear. Forces are "draggable".
- To explain the rules for drawing a free-body diagram.
- To distinguish forces that are external to the system from internal forces.
- To illustrate that a free-body diagram must only include the external forces acting on the considered system
- To construct free-body diagrams for different situations.
Newton’s First Law of Motion states that an object maintains its state of motion unless it is acted upon by a net external force. A Free Body Diagram is a graphical means of analyzing the forces…
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